Two-part aluminum salt antiperspirant aerosol compositions

ABSTRACT

Antiperspirant aluminum salt compositions suitable for dispensing as an aerosol spray from dual dispensing aerosol containers containing the aluminum salt in one chamber of the container and the propellant in the other chamber.

0 United States Patent 1 [111 3,7M,346

Gubernick et al. 1 Jan. 30, 1973 [54] TWO-PART ALUMINUM SALT [56] References Cited ANTIPERSPIRANT AEROSOL UNI ATE PATENTS COMPOSITIONS TED ST S 294l696 6/1960 Homm ..222/402.24 k [76] Inventors ig s a gg z ig': 3,241,722 3/1966 Nissen ..424/47 im' a;""' 3,509,253 4/1970 Babbin ..424/47 Amos Lerner, 6420 Saunders St., R P -k ll f N Y Gi i Primary Examiner-Albert T. Meyers Mosca, 126 E. Avenue, Norwalk, Assistant ExaminerVera C.Clarke Conn. Attorney-Leon E. Tenenbaum [22] Filed: June 19, 1970 [57] ABSTRACT [21] App]. No.: 47,872

Antiperspirant aluminum salt compositions suitable for dispensing as an aerosol spray from dual i gjgg dispensing aerosol containers containing the alu- [58] Field :424/47 68 minum salt in one chamber of the container and the propellant in the other chamber.

3 Claims, No Drawings TWO-PART ALUMINUM SALT ANTIPERSPIRANT AEROSOL COMPOSITIONS This invention relates to antiperspirants. lt particularly relates to an antiperspirant composition which can be applied as a spray from an aerosol dispensing unit.

Active and efficacious antiperspirant products now in use contain aluminum chlorhydroxide, (Al(Ol-l ),,Cl, wherein n is an integer from 1 to 5, usually in a 20 percent aqueous solution, which has been formulated in various types of roll-on, cream, pad and lotion preparations.

Attempts to use such aqueous solutions of aluminum chlorhydroxide in aerosol preparations have generally met with failure due to corrosion of the can, clogging of valves, gellation of product and other technical problems. Reduction of the concentration of the aluminum chlorhydroxide to lower levels, about the order of 5 percent, failed to avoid these difficulties. [t is believed that the corrosion results from the hydrochloric acid which forms on partial hydrolysis of the aluminum chlorhydroxide. However, because of the poor solubility of aluminum chlorhydroxide in suitable non-aqueous solvents such as, for example, ethanol and isopropanol, it is not possible to replace the water by an alcohol.

Aluminum chlorhydroxide in its dry state has also been dispensed from an aerosol as a suspension of fine powder in a non-volatile, non-hygroscopic liquid. The aluminum chlorhydroxide level in these products is from about 0.2 to percent by weight. Since the aluminum chlorhydroxide is inactive in its dry solid state, such products rely on the presence of perspiration to effect solution and activation of the aluminum salt. This is not satisfactory since the extent of perspiration may be low at the time of application and much of the material which is applied may not exert any antiperspirant effect. Furthermore, the non-volatile suspending liquid may cause staining of the clothing of the user.

It has been found that complexing aluminum chlorhydroxide with glycols such as ethylene glycol or propylene glycol gives aluminum chlorhydroxideglycol complexes which are soluble in ethanol (U.S. Pat. No. 3,359,169). While these complexes are alcohol soluble and have antiperspirant activity, their activity is much lower than that of aluminum chlorhydroxide. Although these complexes may be used in a high concentration in aerosol preparations, at concentrations above 10 percent clogging of valves and gellation of product still occur. However, at concentrations of 10 percent or lower, the aluminum chlorhydroxideglycol complexes exhibit rather weak antiperspirant activity due to the large amount of the glycol present in the complex.

It is, accordingly, an object of the present invention to provide an effective antiperspirant composition containing aluminum salts for use in aerosol preparations.

It is a further object of the present invention to provide effective antiperspirant compositions for use in aerosol compositions which produce a minimal corrosion of the container and do not clog the valves.

It is another object of the present invention to provide an effective antiperspirant composition which contains water and does not produce the undesirable effects of corrosion and clogging.

We have now found that the use of a two-part composition in which one part contains an aluminum salt,

such as aluminum chlorhydroxide and the other part contains a propellant, which composition is suitable for application from a duahdispensing aerosol container of the type described in U.S. Pat. Nos. 3,240,396; 3,241,722 and 3,374,926, will provide an antiperspirant composition which can be applied as a spray, and which provides an effective amount of aluminum salts but does not gel and does not produce the undesirable effects of corrosion and clogging. The aerosol containers of the type described in the above patents consist of an outer rigid metallic chamber and an inner flexible chamber. The contents of both chambers are released and mixed by use of a dual dispensing valve.

In practicing our invention we formulate our final compositions to contain from about 5 to 25 percent by weight of aluminum chlorhydroxide. If desired, a small amount of aluminum chloride may be added to that part of the formulation containing the aluminum chlorhydroxide to provide from about 1.5 to 8.0 percent, preferably 3.0 to 5.0 percent, by weight in the final composition.

In preparing the compositions of our invention we preferably place the aluminum chlorhydroxide in the flexible inner chamber of the container. This effectively reduces the corrosion of the container. The propellant is placed in the outer chamber.

An alcohol such as ethanol or isopropanol may be added to either the propellant or the aqueous solution of the aluminum chlorhydroxide to enhance the spray effect. If added to the aqueous solution, the alcohol is added in an amount which will not cause precipitation of the aluminum salt.

The alcohol which is added to the propellant may contain in solution perfumes as well as alcohol-soluble antiperspirants such as scopolamine derivatives or aluminum chlorhydroxide-glycol complexes. The complexes are added in amounts up to 1.0 to 5.0 percent by weight of the final composition.

The invention will be more fully understood from the examples which follow, which examples are given only by way of illustration and are not to be considered as limiting.

In these examples all numerical values refer to parts by weight.

Example No. lnnerChamber l 2 3 4 5 6 7 Aluminum chlorhydroxide i0 Z0 l0 10 50 i5 20 Water 85 80 77 50 65 65 Alcohol (Ethanol 20 10 l0 10 Aluminum chloride 5 3 l0 5 Outer Chamber Propellants I00 25 40 50 40 I00 80 Aluminum Chlorhydroxide- Propylene Glycol Complex' 5 l0 2 Aluminum Chlorhydroxide Ethylene GlycolComplex 5 8 Ethanol 70 50 45 52 I8 If desired, perfumes may be incorporated into the compositions either in the inner or outer chamber.

Any conventional liquid or gaseous propellant may be employed in the compositions of this invention. In the above examples we used Freon 12 which is a 4:1 mixture of difluorodichloromethane and 'monochlorotrifluoromethane, but hydrocarbons such as butane, i-butane and propane or mixtures thereof and other halogenated hydrocarbons sold under the trademark Freon, such as, for example, trichlorotrifluoroethane, dichlorotetrafluoroethane, and the like are also suitable.

The compositions of this invention exhibited potent antiperspirant activity and did not gel after standing for 6 weeks at either room temperature or at 50C. Aerosol cans containing these compositions showed no corrosion after standing for 6 weeks at 50C.

There was practically no clogging of the valves when these compositions are used. An occasional backflow of material from the inner bag to the outer bag may occur after the valve has been shut; which backflow may result in precipitation of aluminum chrlorhydroxide in the outer chamber, especially when there is alcohol in the outer chamber. We have overcome this problem by inserting a check valve in the dip tube leading into the contents of the outer chamber to prevent such backflow.

' one of said composition being in the inner chamber and containing from 10 to 50 parts by weight of an aluminum chlorhydroxide of the formula Al,(Ol-l),Cl wherein n is an integer from l-S, and 50 to parts by weight of water, and part two of said composition being in the outer chamber and containing from 25 to parts by weight of propellant.

2. A composition according to claim 1 wherein part one also contains from 3 to 10 parts by weight of aluminum chloride.

'3. A composition according to claim 1 wherein part two contains 25 to 80 parts by weight of propellant and also contains from 2 to 10 parts by weight of an alcohol soluble aluminum chlorhydroxide-glycol complex and 18 to 70 parts by weight of ethanol. 

1. A two-part antiperspirant composition suitable for application from a dual-dispensing aerosol container having an inner chamber and an outer chamber, part one of said composition being in the inner chamber and containing from 10 to 50 parts by weight of an aluminum chlorhydroxide of the formula Al2(OH)nCl6 n, wherein n is an integer from 1-5, and 50 to 90 parts by weight of water, and part two of said composition being in the outer chamber and containing from 25 to 100 parts by weight of propellant.
 2. A composition according to claim 1 wherein part one also contains from 3 to 10 parts by weight of aluminum chloride. 